The Nymphan calendar has 360 days, 364 when including the four days of Éostara, Lythar, Modrhon and Yulé. We know that there are around 365¼ days in the Gregorian calendar and therefore, we will be missing a day and a quarter every year and by the fourth year, we would have missed 5 and therefore, every four years, 1 day is added to each of the months of March, April and July, where May has 2 extra days.

There are 12 months, which correspond to the ones of Earth. Here are the names of them and what they are abbreviated to.

Code:

January khoran kho
February motan mot
March saléman sal
April arégan are
May harésan hare
June aloéyan alo
July ahrwahan ahr
August samtagan sam
September oloktanan olok
October fuingan fui
November ngoran ngo
December ngastan nga

Every month contains 30 days; the extra days of Éostara, Lythar, Modrhon and Yulé are not counted as numbers, only the weekday, ie Monday/Tuesday etc. The "leap" days have been specially chosen as they correspond with the months in which important characters/authors of the story celebrate their birthday. March is the month of my birthday, April is Lucky's, May is the birthday of both Hopper and Guinea (or at least that is the best estimate for their birthdates), and so two days are added, and finally July is the co-author's birthday. These "leap" days do not follow the days of the week and therefore, every month starts on the same weekday, but are assigned a date.

The days Éostara, Lythar, Modrhon and Yulé are the names of the solstices and equinoxes for the creatures of Nymphfayr. They have been derived from the Pagan names of Ostara, Litha, Modron and Yule. The special dates are celebrated and coincides quite closely with our Gregorian calendar, but they are about one day after the Gregorian celebrations.

Éostara (ay-os-ta-ra) is a time of balance between the amount of daylight and darkness, it is time for growth and youthfulness.

Lythar (li-far) is the day when the sun is at it’s highest power, the longest day of the year, however, also, from this day onwards, the sun’s rule starts to wane.

Modrhon (mod-ron) is another time of balance, however, compared to Éostara, it is time for darker days and for harvest.

Yulé (you-lay) is the day with the shortest amount of daylight, it focuses on the diminished sun but contradicting, it also witnesses the rebirth of the sun.

Narcissus is on the first full moon after Éostara. Even though, due to the additional and special days, the full moon would be out of line, the 15th of each month is usually the closest day to the full moon. Sometimes the actual full moon will land on the 14th or the 16th but this is easily corrected with the lunar calendar.

The position of the 4 special days, collectively called the Duboaché, do change in a four year cycle. I've figured this out by listing all the days of both calendars. >_<

Damn, I had one somewhere, and it worked really well, but I seem to have lost it, and I have no idea how it worked, as I made it 2 years ago._________________Tôśt drônén kókślán! Vón kríngénã Tôśt! Gâgén šníkél dér îwâ!

I think I've explained Adpihi's lunisolar calendar before.
It has days and months and years; it doesn't have weeks so it doesn't have names for days of the week.
It repeats in a cycle every 57 years.
Months are either 29 days long or 30 days long.
Years are either 12 months long or 13 months long.
So there are four different lengths for years when counted in days; depending not only on whether it's a 12-month or a 13-month year, but also on whether it has more 29-day and fewer 30-day months, or more 30-day and fewer 29-day months.
235 months = 19 years.
(Roughly, 360 months = 10631 days; roughly, 400 years = 146097 days.)

Everything else can be figured out from that; not easily, but I've done it before._________________"We're the healthiest horse in the glue factory" - Erskine Bowles, Co-Chairman of the deficit reduction commission